“what’s with this strange dream” maybe?
this one has an older mansion and multiple personalities, but idk if it actually is what you're looking for
https://www.mangago.zone/read-manga/swallow_you_whole/
Nooo but that’s a CLASSIC
It’s not but thank you for reminding me to catch up on that one it’s so good
Is it this one?
https://www.mangago.zone/read-manga/hotel_phryne/
YESSSS I THINK It IS RAHHHHHH THANK YOU!!!!!!! Time to see if my memories line up at all
Glad I can help!
Can’t remember the title or even the story really… It’s a BL , and I think (key word THINK) it’s about the uke stumbling upon/visting this older mansion, and then he’s trapped inside and the seme has like multiple copies of himself and only one is real and the uke has to figure out which one is the real one??? The house was very red (like red curtains/carpets?). No clue if that’s accurate or not, I suddenly remembered it today but I must’ve read it years ago (it was unfinished at the time, I presume it’d be finished now). I thought it was vivarium but no. Any help appreciated!!!